GENERALMcGraw-Edison® VR-32 single-phasestep voltage regulators are tap-changingautotransformers. They regulate distribution line voltages from 10%raise (boost) to 10% lower (buck) inthirty-two steps of approximately 5/8%each. Voltage ratings are availablefrom 2400 volts (60 kV BIL) to 34,500volts (200 kV BIL) for 60 Hz and 50 Hzsystems.

Internal potential winding taps and anexternal ratio correction transformerare provided on all ratings so that eachregulator may be applied to more thanone system voltage.

Smaller kVA sizes are supplied withsupport lugs for pole mounting andwith substation or platform tie downprovisions. Larger sizes are providedwith substation bases with pad-mounting provisions.

Voltage is maintained within desiredlimits by controls that feature superioraccuracy, reliability, and serviceability.Continuity of service is assured byrugged, service-proven tap changersand core-and-coil assemblies functioning with the control.

McGraw-Edison voltage regulatorsare available with a full complementof standard features for routine appli-cations, as well as a full line of option-al accessories for unique applications. In addition, the regulatoroffers desirable features that enhanceoperation and service.

STANDARD FEATURESA sealed-tank construction allows theuse of 65°C rise insulation system in55°C rise rated designs to provide anadditional 12% capacity above thenameplate rating without loss of normal insulation life. Additional load capacity is stated on the nameplate,this ADD-AMP™ feature is availableas long as the tap changer’s maxi-mum current rating is not exceeded.

The unit construction cover suspendsthe internal assembly consisting ofthe core-and-coil assembly, tapchanger, and the reactor for ease ofinspection and maintenance.

All McGraw-Edison regulators aremanufactured and tested to the ANSIStandard C57.15.

Voltage Regulators

Single-Phase Step

Electrical Apparatus

225-10

1June 1998 • Supersedes 01/98 Printed in U.S.A.

Figure 1.VR-32 Voltage Regulator with CL-5C control.

Single-Phase Step

2

Figure 2.VR-32 Voltage Regulator.

MOV-TYPE SERIESARRESTER CLAMP-TYPE TERMINALS

THREADED-STUD BUSHING TERMINALS

BUSHINGS

HANDHOLE COVER

INTERNAL ASSEMBLY LIFTING EYES

UPPER FILTER PRESS CONNECTION

SHUNT ARRESTER MOUNTINGBOSSES (3)

BALL-TYPE OIL SIGHT GAUGE

PANEL-TYPE RADIATORS

CABLE STABILIZING BOSS

GROUND BOSSES (2)

DRAIN VALVE & OIL SAMPLING DEVICE

BOLT-DOWN PROVISIONS (4)

LASER-ETCHED NAMEPLATES (2)(SECOND ON CONTROL ENCLO-SURE DOOR)

REGULATOR LIFTING LUGS

JUNCTION BOX

POSITION INDICATOR

GROUNDING STRAP

COVER

AUTOMATIC PRESSURERELIEF DEVICE

CONTROL CABLE(Disconnectable)

POLE-TYPE MOUNTINGBRACKETS

CONTROL ENCLOSURE

CONTROL

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3

STANDARD FEATURES■ CL-2A control■ Tap changer with motor and power

supply■ Position indicator with ADD-AMP

adjustment■ Two laser-etched nameplates■ Lifting lugs■ Oil drain valve and sampling device■ Upper filter press connection■ Oil sight gauge ■ Mounting provisions for shunt

arresters■ High-creep bushings with clamp-

type terminals■ Bolt-down provisions (overhead

units)■ Pole-type mounting brackets (over-

head units)■ Substation base (substation units)■ External series arrester■ Automatic pressure relief device■ Handhole■ Control cabinet with removable

front panel■ Ratio correction transformer■ Conformally coated circuit boards

OPTIONAL ACCESSORIES■ Shunt arresters■ Extra-length control cables■ Elevating structure■ Control heater■ 4-hole NEMA H-spades■ Cooling fans■ Data reader■ Nameplates in alternate languages

or metric units■ 240 volt external source■ Internal differential potential trans-

former for complete reverse powerflow w/metering (requires CL-5Ccontrol)

■ CL-5C control (optional acces-sories for control listed below)■ SCADA relay■ Fiber optic interface board (for

digital communication)■ CL-Interface program

ARRESTERSSeries Surge ArrestersAll VR-32 Voltage Regulators areequipped with a bypass arrester con-nected across the series windingbetween the source (S) and load (L)bushings. This bypass arrester limitsthe voltage developed across theseries winding during lightning strikes,switching surges and line faults. AMOV type series surge arrester of 3kV offers series winding protection onall regulators except those rated33000 V, which have a 6 kV MOV-type series surge arrester.

Shunt ArrestersA shunt arrester is an optional acces-sory on the VR-32 Voltage Regulatorfor protection of the shunt winding.The shunt arrester is a direct connect-ed arrester mounted on the tank andis connected between the load bush-ing and ground. For additional protec-tion, a shunt arrester may also beinstalled between the source bushingand ground. Shunt arrester applica-tion data is listed in Table 1.

Nominal System Voltages Recommended(volts) MOV Shunt

Regulator ArresterVoltage Delta or Multi-grounded RatingsRating Single-phase Wye (kV)

2500/4330Y 2400 2400/4160 32500 2500/4300

4160 4160/72005000/8660Y 4330 4330/7500 6

4800 4800/83205000 5000/8660

6900 6900/119507620/13200Y 7200 7200/12470 10

7620 7620/132007970 7970/13800

11000 11000 15

1200012470

13800 13200 1513800

14400/24940Y 13800/23900 1814400/24940

19920/34500GrdY 19920/34500 27

22000 22000 27

33000 33000 36

TABLE 1Shunt Arrester Application Data

*Note: Weights anddimensions are forreference only, andnot for constructionpurposes. Forexact dimensions,please contactCooper PowerSystems.

Single-Phase Step

4

Dimensions (mm) Untanking TotalVoltage Load Current Oil Weight Weight

(kV) (Amperes) kVA Figure A B C D E (Liters) (kgs.) (kgs.)

6.6 50 33 1 1893 1716 800 965 508 217 341 609

100 66 1 1892 1715 813 965 508 231 341 609

95 kV 150 99 1 Dimensions available at time of quotation/order.

BIL 200 132 2 1975 1818 915 1232 559 303 445 860

300 198 3 Dimensions available at time of quotation/order.

400 264 3 Dimensions available at time of quotation/order.

500 330 3 Dimensions available at time of quotation/order.

600 396 3 Dimensions available at time of quotation/order.

11.0 50 55 1 1994 1817 694 890 508 208 389 661

100 110 1 1993 1818 864 1194 559 275 432 816

95 kV 150 165 1 2043 1869 1193 1161 610 370 560 1080

BIL 200 220 2 2073 1920 1003 1320 635 360 649 1211

300 330 3 2370 2208 998 1633 711 674 1007 1964

400 440 3 2624 2462 1081 1784 838 1060 1059 2545

500 550 3 Dimensions available at time of quotation/order.

600 660 3 Dimensions available at time of quotation/order.

15.0 50 75 1 Dimensions available at time of quotation/order.

100 150 1 2068 1869 1107 1110 610 344 573 1007

150 kV 150 225 2 2145 1971 1163 1278 660 479 707 1334

BIL 200 300 3 2371 2209 1095 1445 711 555 910 1800

300 450 3 2472 2310 1022 1701 762 791 1191 2252

400 600 3 2700 2539 1275 1786 838 1098 1434 2904

500 750 3 Dimensions available at time of quotation/order.

22.0 50 110 1 2093 1920 927 1270 635 371 455 945

100 220 2 2174 2031 1005 1405 711 550 783 1494

150 kV 150 330 3 2326 2183 1075 1467 737 659 1005 1873

BIL 200 440 3 2396 2234 1036 1704 762 765 1223 2243

300 660 3 2675 2414 1330 1848 889 1213 1566 3086

33.0 50 165 3 2895 2754 799 1294 762 757 1080 1957

100 330 3 3100 2947 1003 1585 965 1480 1638 3249

200 kV 150 495 3 3142 2981 1285 1839 965 1567 1765 3616

BIL 200 660 3 3264 3086 1166 1921 965 1648 1835 3915

TABLE 2Ratings and Dimensions – 50 Hz

FIGURE 1 FIGURE 2EE

B

A

C

D

B

A

C

D

B

A

C

D

EFIGURE 3

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5

Dimensions (in.) Untanking TotalVoltage Load Current Oil Weight Weight

(kV) (Amperes) kVA Figure A B C D E (Gallons) (Ibs.) (Ibs.)

2.5 200 50 1 71 64 30 39 20 51 615 1200

300 75 1 80 74 36 47 25 106 745 1810

60 kV 400 100 1 80 74 37 52 25 108 803 1938

BIL 668 167 1 95 89 40 49 24 132 110 2560

1000 250 3 110 110 28 61 26 179 2435 4345

1332 333 3 103 103 37 61 26 183 2450 4755

1665 416 Dimensions available at time of quotation/order.

5.0 100 50 1 71 64 30 39 20 51 625 1210

200 100 1 75 68 35 49 22 71 823 1595

75 kV 250 125 Dimensions available at time of quotation/order.

BIL 334 167 1 75 75 36 53 22 84 986 2051

500 250 3 98 92 36 59 24 141 1405 3250

668 333 Dimensions available at time of quotation/order.

833 416 3 105 98 42 70 32 272 2305 5415

7.62 50 38 1 71 64 24 34 20 50 505 1030

75 57 1 75 68 30 39 20 55 635 1185

95 kV 100 76 1 75 68 31 41 20 56 665 1265

BIL 150 114 1 75 68 35 49 22 71 785 1585

219 167 2 78 72 36 49 22 81 995 1975

328 250 2 84 78 44 56 25 100 1285 2530

438 333 3 97 91 38 61 26 153 1725 3525

548 416 3 102 96 44 61 27 210 2075 4485

656 500 3 100 93 40 67 30 224 2222 4934

875 667 3 100 97 48 68 31 247 3060 5995

1093 833 3 123 119 63 73 35 448 5620 10620

13.8 50 69 1 75 68 31 41 22 65 831 1538

100 138 1 79 72 34 47 22 74 1070 1930

95 kV 150 207 1 81 74 40 54 25 104 1180 2550

BIL 200 276 2 80 74 45 51 25 106 1425 2750

300 414 3 94 87 53 62 28 177 3525 5790

362 500 3 103 97 57 70 33 287 2550 6080

400 552 Dimensions available at time of quotation/order.

483 667 Dimensions available at time of quotation/order.

604 833 Dimensions available at time of quotation/order.

14.4 50 72 1 75 68 32 43 22 66 767 1491

100 144 1 77 70 39 54 25 85 1065 2080

150 kV 200 288 2 82 76 45 52 25 97 1485 2760

BIL 231 333 3 92 86 34 61 27 145 1967 3700

289 416 3 92 85 49 62 28 168 2059 4186

300 432 3 92 86 60 63 29 204 2040 4475

347 500 3 102 95 46 68 33 257 2695 5410

400 576 3 104 97 40 66 30 233 2705 5460

463 667 3 108 102 51 71 33 289 3060 6265

500 720 3 108 102 51 71 33 285 3005 6420

578 833 3 107 101 53 73 35 318 3630 7125

19.92 50.2 100 1 79 72 39 41 24 95 1010 2010

100.4 200 2 85 78 40 54 26 125 1475 2820

150 kV 167 333 3 94 87 42 55 28 165 2100 3875

BIL 200.8 400 3 96 87 46 62 28 171 2155 4110

250 500 3 104 97 46 68 33 263 2610 5520

335 667 3 106 100 50 71 33 287 3095 6285

418 833 3 107 101 60 73 35 324 3245 7115

502 1000 3 118 109 46 75 38 311 4115 8645

TABLE 3Ratings and Dimensions – 60 Hz

CONTROLSCL-2A■ Internal-external voltage source

switch■ Automatic/manual control switch■ Manual raise/lower toggle switch■ Position indicator drag hand reset

switch■ Neutral indicating light■ Six-digit operations counter■ Panel-mounted fuses■ Band edge indicators■ Voltage test terminals■ External voltage source terminals■ Control knob locking devices■ Set voltage adjustment■ Bandwidth adjustment■ Time delay adjustment■ Line drop compensator settings■ Resistance and reactance reverse

polarity switch■ Provisions to allow remote override

of regulator operation via discrete(analog) supervisory control

CL-5C■ Source side voltage calculated

from tap position■ Internal-external voltage source

switch■ Automatic/manual control switch■ Manual raise/lower toggle switch■ Position indicator drag hand reset

switch■ Supervisory ON-OFF switch (for

use with SCADA)■ Neutral indicating light■ Six-digit operations counter■ Panel-mounted fuses■ Band edge indicators■ Voltage test terminals■ External voltage source terminals■ Set voltage adjustment■ Bandwidth adjustment■ Time delay adjustment■ Line drop compensator settings■ Resistance and reactance reverse

polarity switch■ Digital metering package (including

instantaneous, demand, and time-tagged demand)

■ Profile recorder■ Tap position indication tracking

capability■ Voltage limiting (“First house pro-

tection”)■ Voltage reduction with 3 modes■ Reverse power flow detection■ Provisions to allow remote override

of regulator operation via discrete(analog) supervisory control

■ Digital communications capability■ Resident communications protocol

(DATA 2179)■ Data port for data reader or per-

sonal computer attachment

CONSTRUCTIONCore and Coil AssemblyEase of service is provided by thedesign of the core-and-coil, tapchanger, and reactor assembly. Theentire assembly is cover suspended for ease of removal from the tank forinspection or maintenance.

The coil assembly features an aluminum strip in the series windingthat achieves the optimum in ampereturn balance for exceptional strengthunder through-fault conditions.

Grain-oriented steel is used in thecore, with a low reluctance butt joint.The rugged core clamp assemblysecures the coil effectively and posi-tions the core for the optimum in quietoperation and low core loss.

With sealed-tank construction, theexternal oxygen supply is eliminatedfrom the tank environment. With theuse of a 65°C rise insulation systemand designs with a nameplate ratingof 55°C, an additional 12 percentcapacity is available from theMcGraw-Edison 32-step regulatorwithout any loss of insulation life.

Tap ChangersSpring-drive tap changers are typical-ly used in regulators rated below 15kV, 219 A and below; and units rated19.92 kV, 100.4 A and below. Aspring-drive tap changer is shown inFigure 4. In the larger sizes, the tapchange is accomplished by a direct-drive mechanism. A direct-drive tapchanger is shown in Figure 5. Smoothtap changes and long contact life areassured through careful design ofspeed controlling components.

Single-Phase Step

6

Figure 3.Core and coil, tap changer and reactorassembly.

Figure 4.Spring-drive tap changer.

Figure 5.Direct-drive tap changer.

REACTORTAP CHANGER

CORE-AND-COILASSEMBLY

CORE CLAMP

Position Indicator andADD-AMP CapabilityThe position indicator is mounted ona junction box on the cover of the regulator, and is directly connected tothe tap changer by a flexible drive shaftpassing through the junction box andterminal board via a sealing gland.

The indicator face is graduated insteps, numbered 1 through 16 oneach side of zero. Zero designatesneutral. Drag hands indicate the max-imum and minimum positions attainedduring raise and lower operations.The drag hands are reset around theposition indicator hand by operatingthe drag hand reset switch on thecontrol front panel.

The ADD-AMP feature of VR-32 regulators allows increased currentcapacity by reducing the regulationrange. This is accomplished by settinglimit switches in the position indicatorto prevent the tap changer from traveling beyond a set position, ineither raise or lower directions. Thelimit switches have scales graduatedin percent regulation, and areadjustable to specific values of 5, 6-1/4,7-1/2, 8-3/4, and 10% regulation toalter the regulation range. The fivepossible load current ratings associatedwith the reduced regulation rangesare summarized in Tables 4 and 5. Ateach setting, a detent stop providespositive adjustment. Settings otherthan those with stops are not recom-mended. The raise and lower limitsneed not be the same value unlessreverse power is possible.

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7

Figure 6.Position Indicator.

TABLE 4ADD-AMP Capabilities of 50 Hz Ratings

Load Current Ratings (Amperes)1

Regulation RangeRated RatedVolts kVA ±10%1 ±8 3/4% ±7 1/2% ±6 1/4% ±5%

33 50 55 60 68 8066 100 110 120 135 16099 150 165 180 203 240132 200 220 240 270 320

6600 198 300 330 360 405 480264 400 440 480 540 640330 500 550 600 668 668396 600 660 668 668 668

55 50 55 60 68 80110 100 110 120 135 160165 150 165 180 203 240220 200 220 240 270 320

11000 330 300 330 360 405 480440 400 440 480 540 640550 500 550 600 668 668660 600 660 668 668 668

75 50 55 60 68 80150 100 110 120 135 160225 150 165 180 203 240

15000 300 200 220 240 270 320450 300 330 360 405 480600 400 440 480 540 640750 500 550 600 668 668

110 50 55 60 68 80220 100 110 120 135 160

22000 330 150 165 180 203 240440 200 220 240 270 320660 300 330 360 405 480

165 50 55 60 68 8033000 330 100 110 120 135 160

495 150 165 180 203 240660 200 220 240 270 320

1 Additional 12% increase in capacity is available due to the use of 65° C winding rise insulation if the tap changer’s maximum current rating has not been exceeded. For loading in excess of the above values please contact Cooper Power Systems customer service.

Single-Phase Step

8Printed on Recycled Paper

© 1998 Cooper Power Systems, Inc.McGraw-Edison® is a registered trademark of Cooper Industries, Inc.

MI6/98

TABLE 5ADD-AMP Capabilities of 60 Hz Ratings

Load Current Ratings (Amperes)1

Regulation RangeRated RatedVolts kVA ±10% ±8 3/4% ±7 1/2% ±6 1/4% ±5%

25 100 110 120 135 16050 200 220 240 270 32075 300 330 360 405 480100 400 440 480 540 640

2500 125 500 550 600 668 668167 668 668 668 668 668250 1000 1000 1000 1000 1000333 1332 1332 1332 1332 1332

416.3 1665 1665 1665 1665 1665

25 50 55 60 68 8050 100 110 120 135 160100 200 220 240 270 320125 250 275 300 336 400

5000 167 334 367 401 451 534250 500 550 600 668 668333 668 668 668 668 668

416.3 833 833 833 833 833

38.1 50 55 60 68 8057.2 75 83 90 101 12076.2 100 110 120 135 160

114.3 150 165 180 203 2401672 219/232 241/255 263/278 296/313 350/370

7620 2502 328/347 361/382 394/417 443/469 525/5563332 438/464 482/510 526/557 591/625 668

416.32 548/580 603/638 658/668 668 6685002 656/668 668 668 668 6686672 875/926 875/926 875/926 875/926 875/9268332 1093/1157 1093/1157 1093/1157 1093/1157 1093/1157

69 50 55 60 68 80138 100 110 120 135 160207 150 165 180 203 240276 200 220 240 270 320

13800 414 300 330 360 405 480500 362 398 434 489 579552 400 440 480 540 640667 483 531 580 652 668833 604 664 668 668 668

72 50 55 60 68 80144 100 110 120 135 160288 200 220 240 270 320333 231 254 277 312 370416 289 318 347 390 462

14400 432 300 330 360 405 480500 347 382 416 468 555576 400 440 480 540 640667 463 509 556 625 668720 500 550 600 668 668833 578 636 668 668 668

50 25.1 28 30 34 40100 50.2 55 60 68 80200 100.4 110 120 135 160

19920 333 167 184 200 225 267400 200.8 220 240 270 320500 250 275 300 338 400667 335 369 402 452 536833 418 460 502 564 668

50 50 55 60 68 80100 100 110 120 135 160

34500 150 150 165 180 203 240200 200 220 240 270 320

1 Additional 12% increase in capacity is available due to the use of 65° C winding rise insulation if the tap changer’s maximum current rating has not been exceeded. For loading in excess of the above values please contact Cooper Power Systems customer service.

2 Regulators are capable of carrying current corresponding to rated kVA when operated at 7200 volts.

P.O. Box 1640Waukesha, WI 53187www.cooperpower.com